HK_LongZhiMeng/Assets/FiremanAnimation/Scripts/ThirdPersonCamera.cs

using UnityEngine;

public class ThirdPersonCamera : MonoBehaviour
{
    public Transform target;
    public FiremanControl firemanControl;
    [SerializeField]  LayerMask collisionLayers = new LayerMask();
    private readonly bool AllowRotation = true;
    [SerializeField] private Vector2 targetOffset = new Vector2();
    [HideInInspector] public bool stayBehindTarget = false;
    
    private Transform objectsToRotate;

    public Vector2 originRotation = new Vector2();
    private bool returnToOrigin = true;
    private float returnSmoothing = 3;


    public float distance = 5;
    public float minDistance = 0;
    public float maxDistance = 10;

    private Vector2 sensitivity = new Vector2(3, 3);

    private float zoomSpeed = 1;
    private float zoomSmoothing = 16;
    private float zoomAltDelay = 0.5f;

    private float minAngle = -90;
    private float maxAngle = 90;

    private float _zoom_in_timer = 0;
    private float _zoom_out_timer = 0;

    [HideInInspector] public float _wanted_distance;
    private Quaternion _rotation;
    private Vector2 _input_rotation;

    private Transform _t;

    void Start()
    {
        _t = transform;
        _wanted_distance = distance;
        _input_rotation = originRotation;

        // If no target set, warn the user
        if (!target)
        {
            Debug.LogWarning("ThirdPersonCamera: No initial target set");
        }

    }

    void Update()
    {

        if (target)
        {
            if (firemanControl.driving)
            {
                objectsToRotate = firemanControl.carCamPoint.transform;
                stayBehindTarget = true;
            }

            else
            {
                objectsToRotate = firemanControl.transform;
                stayBehindTarget = false;
            }
                
        }

    }

    // Camera movement should be done in LateUpdate(),
    // but it is slightly choppy for some reason so changed to FixedUpdate()
    // seems to be working fine
    void FixedUpdate()
    {
        if (target)
        {
            // Zoom control
            if (Input.GetAxis("Mouse ScrollWheel") < 0 || _zoom_out_timer > zoomAltDelay)
            {
                _wanted_distance += zoomSpeed;
            }
            else if (Input.GetAxis("Mouse ScrollWheel") > 0 || _zoom_in_timer > zoomAltDelay)
            {
                _wanted_distance -= zoomSpeed;
            }

            // Prevent wanted distance from going below or above min and max distance
            _wanted_distance = Mathf.Clamp(_wanted_distance, minDistance, maxDistance);

            // If user clicks, change position based on drag direction and sensitivity
            // Stop at 90 degrees above / below object

            if (AllowRotation && (Input.GetMouseButton(0) || Input.GetMouseButton(1)))
            {
                _input_rotation.x += Input.GetAxis("Mouse X") * sensitivity.x;

                ClampRotation();

                _input_rotation.y -= Input.GetAxis("Mouse Y") * sensitivity.y;

                _input_rotation.y = Mathf.Clamp(_input_rotation.y, minAngle, maxAngle);

                _rotation = Quaternion.Euler(_input_rotation.y, _input_rotation.x, 0);

                // If user is right clicking, set the default position to the current position
                if (Input.GetMouseButton(1))
                {
                    objectsToRotate.rotation = Quaternion.Euler(0, _input_rotation.x, 0);
                    originRotation = _input_rotation;
                    ClampRotation();
                }
            }
            else
            {
                if (stayBehindTarget)
                {
                    originRotation.x = target.eulerAngles.y;
                    ClampRotation();
                }
                // If Return To Origin, move camera back to the default position
                if (returnToOrigin)
                {
                    _input_rotation = Vector3.Lerp(_input_rotation, originRotation, returnSmoothing * Time.deltaTime);
                }

                _rotation = Quaternion.Euler(_input_rotation.y, _input_rotation.x, 0);
            }

            // Lerp from current distance to wanted distance
            distance = Mathf.Clamp(Mathf.Lerp(distance, _wanted_distance, Time.deltaTime * zoomSmoothing), minDistance, maxDistance);

            // Set wanted position based off rotation and distance
            Vector3 wanted_position = _rotation * new Vector3(targetOffset.x, 0, -_wanted_distance - 0.2f) + target.position + new Vector3(0, targetOffset.y, 0);
            Vector3 current_position = _rotation * new Vector3(targetOffset.x, 0, 0) + target.position + new Vector3(0, targetOffset.y, 0);

            RaycastHit hit;

            if (Physics.Linecast(current_position, wanted_position, out hit, collisionLayers))
            {
                distance = Vector3.Distance(current_position, hit.point) - 0.2f;
            }


            // Set the position and rotation of the camera
            _t.position = _rotation * new Vector3(targetOffset.x, 0.0f, -distance) + target.position + new Vector3(0, targetOffset.y, 0);
            _t.rotation = _rotation;
        }
    }

    private void ClampRotation()
    {
        if (originRotation.x < -180)
        {
            originRotation.x += 360;
        }
        else if (originRotation.x > 180)
        {
            originRotation.x -= 360;
        }

        if (_input_rotation.x - originRotation.x < -180)
        {
            _input_rotation.x += 360;
        }
        else if (_input_rotation.x - originRotation.x > 180)
        {
            _input_rotation.x -= 360;
        }
    }
}